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Ouch! Don't use non-standard fonts for things that don't make sense in others!
I don't quite get what you're attempting to do with this. First you said "points," but then you gave an example of "25%?" You want to give a percentage of a total amount of points? Or you want to start with a set number of points then deduct from those points using a percentage system?

Your markup is overly complex, as a result, my script probably is too. Really though, this sort of thing should be done server side unless cheating isn't an issue and client side javascript enabled is highly likely. Your images would look better with transparent backgrounds, that way they will blend in on all browsers:

The script was the easy part. I would like to repeat that this should be done server side (something I'm not much up on) unless, it is OK if folks cheat (they would only be cheating themselves, that sort of thing) and you can be reasonably sure folks will have javascript enabled - like telling them it is required for the link to this 'self evaluation' form.